Microstructure evolution and cyclic oxidation performance of Cr2AlC transition layer as active diffusion barrier for Ni-based superalloy and NiCrAlY coating
Source abstract
Abstract
Cr 2 AlC transition layer between the NiCrAlY coating and K417G superalloy was prepared to improve oxidation resistance of conventional NiCrAlY coating. Long-term cyclic oxidation was conducted at 1000 °C. Cr 2AlC transition layer decomposed to Cr 7C 3 after annealing and further transformed to thermodynamically more stable continuous Cr 23C 6 during subsequent oxidation. Continuous Cr 23C 6 effectively blocked diffusion between NiCrAlY coating and substrate. Cr 2AlC transition layer also supplied additional Al for NiCrAlY coating, greatly extended service life of the NiCrAlY coating. Furthermore, Cr 2AlC, Cr 23C 6 and Cr 7C 3 were thermally matched to substrate and coating, avoiding coating spallation during cyclic oxidation.
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Research context
OpenAlex topics: High-Temperature Coating Behaviors · Metal and Thin Film Mechanics · Intermetallics and Advanced Alloy Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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